added a comment about the current choose_node policy to ddfs_master
added a comment about the current choose_node policy to ddfs_master

mwilliams3/disco,pooya/disco,pombredanne/disco,oldmantaiter/disco,ktkt2009/disco,pombredanne/disco,mwilliams3/disco,seabirdzh/disco,scrapinghub/disco,ErikDubbelboer/disco,beni55/disco,discoproject/disco,mozilla/disco,ktkt2009/disco,mwilliams3/disco,ErikDubbelboer/disco,oldmantaiter/disco,pavlobaron/disco_playground,ktkt2009/disco,seabirdzh/disco,seabirdzh/disco,beni55/disco,pooya/disco,ErikDubbelboer/disco,scrapinghub/disco,pavlobaron/disco_playground,pooya/disco,discoproject/disco,mozilla/disco,pavlobaron/disco_playground,ErikDubbelboer/disco,oldmantaiter/disco,pombredanne/disco,seabirdzh/disco,mozilla/disco,beni55/disco,ktkt2009/disco,scrapinghub/disco,scrapinghub/disco,discoproject/disco,pooya/disco,mozilla/disco,pombredanne/disco,beni55/disco,ErikDubbelboer/disco,simudream/disco,discoproject/disco,discoproject/disco,mwilliams3/disco,simudream/disco,simudream/disco,seabirdzh/disco,oldmantaiter/disco,mwilliams3/disco,pavlobaron/disco_playground,simudream/disco,beni55/disco,pombredanne/disco,ktkt2009/disco,simudream/disco,oldmantaiter/disco